FB_BA_Swi2P

The function block FB_BA_Swi2P is a two-point switch with one switch-on point and one switch-off point.

A binary output signal is generated based on a comparison of the input signal fIn with the switch-on point fOn and the switch-off point fOff.

A general function block enable can be implemented at input bEn. If bEn is FALSE, the output bQ is also FALSE. The control direction of the function block depends on the relative position of the switch-on/switch-off points.

If the switch-on point is greater than the switch-off point, the control direction is direct/synchronous (cooling mode).

If the switch-off point is greater than the switch-on point, the control direction is indirect/reversed (heating mode).

Inputs

VAR_INPUT
  bEn           : BOOL;
  fIn           : REAL;
  fOn           : REAL;
  fOff          : REAL;
  nDlyOn        : UDINT;
  nDlyOff       : UDINT;
END_VAR

Name	Type	Description
bEn	BOOL	General enable of the function block.
fIn	REAL	Input value
fOn	REAL	Switch-on point
fOff	REAL	Switch-off point
nDlyOn	UDINT	Start-up delay [s]
nDlyOff	UDINT	Switch-off delay [s]

Outputs

VAR_OUTPUT
  bQ                 : BOOL;
  nRemTiDlyOn        : UDINT;
  nRemTiDlyOff       : UDINT;
END_VAR

Name	Type	Description
bQ	BOOL	Calculated output value of the characteristic curve.
nRemTiDlyOn	UDINT	Remaining time of the start-up delay [s].
nRemTiDlyOff	UDINT	Remaining time of the switch-off delay [s].

Requirements

Development environment	Required PLC library
TwinCAT from v3.1.4024.22	Tc3_BA2 from v5.2.5.0